Started as a site for college students to stay in touch with friends, it came into a market that had been dominated with sites like Friendster and MySpace, which was less than a year old at the time of Facebook's launch.

Facebook now has an estimated 900 million unique visits per month, far ahead of Twitter, its biggest competitor, which has an estimated 310 million unique visitors per month.

For many people, Facebook has become a part of their daily routine, making it hard to think of a time before the site existed, or before it was open to everyone -- including businesses -- and not just students at a select number of colleges across the country.

It might surprise you to hear some of the things that haven't been around as long as the popular social networking site, including the life of Alana Thompson (a.k.a. Honey Boo Boo), iPhones and the Twilight saga.

In honor of Facebook's 10th birthday, here are 25 things that haven't been around as long as the social network. For our mobile users, click here.